Make WebView keep keyboard when losing focus

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index d0c951da7c477f2ad72424b826e488c551975a40..6aac0fb7572ab9b0552ab11b4ff8d0e6095baeee 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -1308,6 +1308,7 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
         assert mWebContents != null;
         hidePopupsAndPreserveSelection();
         mWebContents.onHide();
+        mImeAdapter.resetAndHideKeyboard();

[Changwan Ryu, 2016/09/21 01:22:45]

As we talked offline, I'm still not convinced that we can call this on hiding a
tab. There is no guarantee that either previous tab's view or new tab's view is
active at this point. There is a chance that keyboard hiding may not be
effective. Could it be one of the causes of test flakiness?

     }
 
     private void hidePopupsAndClearSelection() {